The Rapid City, SD metropolitan area, as defined by the United States Census Bureau. Anchored by the city of Rapid City, the area corresponds to the entirety of Pennington and Meade counties in the state of South Dakota, though the Rapid City market area extends well beyond those counties and into Nebraska, Montana, Wyoming, and North Dakota. The population was 139,074 at the 2020 census. According to the 2024 census estimates, the MSA has a population of 156,227.
As of the 2010 census, there were 126,382 people, 51,154 households, and 33,390 families residing in the MSA. The population density was 20.2 people per square mile (7.8/km2). There were 55,949 housing units at an average density of 8.9 per square mile (3.4/km2). 27.9% were of German, 7.2% Irish, 6.7% Norwegian, and 5.2% English ancestry.
There were 51,154 households, out of which 32.0% had children under the age of 18 living with them, 49.2% were married couples living together, 11.2% had a female householder with no husband present, and 34.7% were non-families. 28.0% of all households were made up of individuals, and 9.4% had someone living alone who was 65 years of age or older. The average household size was 2.45 and the average family size was 2.93.
The median income for a household in the MSA was $37,239, and the median income for a family was $42,667. Males had a median income of $28,590 versus $21,029 for females. The per capita income for the MSA was $18,309.
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United States 
South Dakota